The leak and distribution of classified U.K.-U.S. trade documents online is tied to a previous Russian disinformation campaign, the social media site Reddit said Friday, fueling fears that Moscow is seeking to interfere in Britain¡¯s upcoming election.

Britain¡¯s opposition Labour Party seized on the leaked documents on Nov. 27, saying they showed the ruling Conservatives were plotting to offer the state-run National Health Service for sale in trade talks with Washington.

The NHS is much loved by Britons and has become an important issue in the country¡¯s election campaign, in which Labour trails the Conservatives despite cutting its lead in some polls.